JP2529169Y2 - Internal wiring of power tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Application Field of the Invention] The present invention relates to internal wiring of a power tool having a commutator motor therein.

[Background of the invention]

As shown in FIG. 5, a conventional stator is provided with a brush terminal on a terminal receiving portion of a terminal block provided on one of the stators 4.
The lead wire 12 to which 11 was connected and the lead wire for power supply connection were connected. If the length of the lead wire 12 to which the brush terminal 11 is connected is lengthened, there is a problem that the lead wire 12 may come into contact with the rotor or be caught between other components, resulting in disconnection and poor insulation. Needed to be shorter. For this reason, the operation of connecting the brush terminal 11 of the stator 4 to the brush holder mounted on the housing is as follows.
The procedure was such that the stator 4 was incorporated into the housing, and then the brush terminal 11 was connected.

In the above connection work, since there is no space near the carbon brush mounting portion where the hand of the operator or the mounting jig can be easily passed, the inside of the hole in which the carbon brush is mounted or the inside of the stator 4 incorporated in the housing. I was using a small space. For this reason, the workability is very poor, the skill is required, and the assembling time is long. Therefore, the cost of the power tool is higher than necessary.

[Purpose of the invention]

The purpose of the present invention is to eliminate the above-mentioned disadvantages of the prior art,
An object of the present invention is to provide an inexpensive power tool by shortening the assembling time.

[Outline of the invention]

The present invention focuses on the fact that if the brush terminal is made of a conductive elastic body in a spring shape, the brush holder can be clamped by the restoring force of the elastic body and can be electrically connected, and the brush terminal can be connected to the brush holder only by pressing force. The internal wiring of the power tool is configured so as to be able to make the connection.

[Example of the invention]

 FIG. 1 shows an embodiment of the present invention.

In the figure, a rotor 1 is supported by a housing 3 via bearings 2 at both ends. The stator 4 is provided on the outer periphery of the rotor 1.
The stator 4 is wound around a stator winding 5 and is fixed to the housing 3. A winding start portion and a winding end portion (not shown) of the stator winding 5 are connected to a plurality of female terminals 7 provided on the first terminal block 6. The first terminal block 6 is formed of an insulating material and is fixed to an end face of the stator 4. Second terminal block 13 integrally formed on first terminal block 6 with an insulating material
And the male terminal 14 of the second terminal block 13 is connected to the female terminal 7.
And a brush terminal 11 made of a conductive elastic body sandwiches and electrically connects the brush holder 9.

2 and 3 show a second terminal block 13 which is a component of this embodiment. The second terminal block 13 has a male terminal 14 similar to the rotor 7 connected to both ends of the stator winding 5, and an arm 15 having a fixing rib 16 for the lead wire 12 and a cooling air guide rib 18. And are formed integrally. The arm terminal 15 is provided with a brush terminal 11 connected to the brush holder 9. A switch, a cord (not shown), and a lead wire 12 for connection to the brush terminal 11 are connected to one end of the male terminal 14 and held on the arm 15 by a rib 16 and a lead wire fixing groove 17. .

FIG. 4 is a side view showing one embodiment of the brush terminal 11, and a solid line shows an initial shape of the brush terminal 11,
The broken line indicates the shape when connected to the brush holder 9. The brush terminal 11 is formed of a conductive elastic body, and has an inclined portion 19 so that the brush terminal 9 is elastically deformed when pressed against the brush holder 9 by the pressing force F1 to easily hold the brush holder 9. The brush terminal 11, which is connected while being elastically deformed by the pressing force F1, holds the brush holder 9 with a slight deformation as shown by a broken line. The brush terminal 11 is connected to the brush holder 9 by the restoring force F2 generated by the slight deformation described above, and is also electrically connected.

In the above configuration, when the second terminal block 13 is connected to the first terminal block 6 provided on the stator 4 in a plug-in manner, and the stator 4 is assembled into the housing 3, the brush terminal 11 is automatically turned into a brush. The connection with the holder 9 is completed, and the internal wiring is completed at the same time.

[Effect of the invention]

According to the present invention, the brush terminal is formed of a substantially U-shaped conductive elastic body, and the connection of the brush holder is enabled only by the pressing force. Therefore, when the second terminal block is incorporated in the housing, the connection is automatically performed. Once completed, assembly time can be reduced.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of a power tool according to the present invention, FIG. 2 is a front view showing an embodiment of a second terminal block constituting the present invention, and FIG. 3 is A in FIG. -A line sectional view, fourth
FIG. 5 is a side view showing an embodiment of a brush terminal which is a component of the present invention, and FIG. 5 is a side view showing an example of a conventional stator. In the figure, 1 is a rotor, 2 is a bearing, 3 is a housing,
4 is a stator, 5 is a stator winding, 6 is a first terminal block, 7 is a female terminal, 8 is a carbon brush, 9 is a brush holder, 10 is a brush cap, 11 is a brush terminal, 12 is a lead wire, 13 Is a second terminal block, 14 is a male terminal, 15 is an arm portion of the second terminal block, 16, 20, 21 are ribs, 17 is a groove, 18 is a cooling air guide rib, and 19 is an inclined portion.

Claims (1)

(57) [Scope of request for utility model registration] A commutator motor as a power source and a housing to which a brush holder for holding a carbon brush is attached, and a plurality of motors arranged at one end of a stator of the commutator motor and connected to ends of stator windings. A first terminal block made of an insulating material having embedded therein the terminals, and a plurality of terminals and a brush holder disposed between the first terminal block and the housing and electrically connectable to the plurality of terminals of the first terminal block. A power tool having a second terminal block made of an insulating material provided with a brush terminal to be connected, wherein the brush terminal is substantially open with a brush holder side open so as to fit the outer periphery of the brush holder so as to clamp the brush holder. Constructed of a U-shaped conductive elastic body and provided with inclined portions that open outward at both ends on the opening side, so that the brush terminal can be fitted and clamped to the brush holder only by pressing force, The internal wiring of the power tool, wherein the brush terminal and the brush holder can be electrically connected.